Malicious PDF — malware analysis report

Static analysis result for SHA-256 676a0b7f5a2f6482…

MALICIOUS

PDF

66.9 KB Created: 2020-11-20 06:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 21644b4425ae28d9d6dc756ff6d3da4c SHA-1: ddfd2f28e29b9ff7a6c7a553380d3694980b657d SHA-256: 676a0b7f5a2f648279fffff3b061c5cd20aa551d7fb9f04c363f70936c9d10dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=nb_itn+practice+skills+assessment+- PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451766/normal_5fa0290c17f6e.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/xebuxukiwagutebisajo.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/8e761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f928f47031ce.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/1415818.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/3814443.pdfIn PDF document text
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/bunupevetomadez_jiditikutan_medafabonife_fivakutaze.pdfIn PDF document text
    • https://vebaruroximowut.weebly.com/uploads/1/3/4/3/134342498/nixajodukutofod-vaver-masunifolat-vidoxewin.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/6f45f6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a188304e-db07-47d2-97b6-a6f4a13f3f7e/91400619560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74b2c8c-6564-4e9e-b58e-2aad431160b9/2000_chevy_blazer_chilton_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 5312 bytes
SHA-256: 714e232a83ec2655f6c52fee660e0acd90ebc3a39d1c8aa614f9d915fc8c172f
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10108 bytes
SHA-256: 7c4e7a686de73211f7e1f4c050484d4704fbfb196353352d6f9c6544e2dceb28

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